Riddle Challenge

 There once was a poet
Who lost his love Lenore
Great was his sorrow
He drank as if there was no tomorrow
What's his name I dare you?

There once was a group of mop-haired guys
Who started a rock band in Liverpool
They became internationally acclaimed
In the rock and roll scene
Leading the British invasion of the US
Originally nicknamed "The Fab Four"
They became later known as what?

These are just examples of my riddles
Whoever got the correct answer
May continue until we're full of riddles
A book of riddles in the making
Sounds like a good idea
Don't you think so?